Chemical composition and mechanical properties of Q690C steel plate

Chemical composition and mechanical properties of Q690C steel plate

Chemical composition of Q690C steel plate (element composition: wt%):

Carbon (C) ≤ Dao 0.18
Manganese (Mn)≤2.00
Silicon (Si)≤0.60
Phosphorus (P): ≤0.025
Sulfur (S): ≤0.020
Niobium (Nb): ≤0.11
Vanadium (V): ≤0.12
Titanium (Ti): ≤0.20
Chromium (Cr): ≤1.00
Nickel (Ni): ≤0.80
Copper (Cu): ≤0.80
Nitrogen (N): ≤0.015
Molybdenum (Mo): ≤0.30
Boron (B): ≤0.004
Aluminum (Al): ≥0.015
Calculation formula of carbon equivalent in Q690C steel plate: CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.

Mechanical properties of Q690C steel plate
Tensile strength σb (MPa) Nominal thickness (mm) ≤40 >40～63 >63～80
Tensile strength σb (MPa) 770～940 750～920 730～900
Q690C specification 3-180 1800-3000 5000-13000
Yield strength σs (MPa) Nominal thickness (mm) ≤16 >16～40 >40～63 >63～80
Yield strength σs (MPa ≥690 ≥670 ≥660 ≥64

When the Q690C steel plate is inspected, the tensile and yield values will be slightly higher than the standard value by about 100Mpa.

Q690C steel plate is widely used in the manufacture of coal mining machinery and engineering machinery, such as hydraulic supports, port cranes, and some parts of flatbed transport vehicles.